听力原文:W: Excuse me, do you live in London? M: Yes , I do. I live in Hampstead. W: Hampstead ? I live in Hampstead, too. London is a funny place. I don't know my next-door neighbor. M: I live in Pond Street. W: That's funny! I live in Pond Street, too. M: I live in number 24 Pond Street. W: I live in number 23 ! You are my next-door neighbor ! What is the relationship between the two speakers?